Error: "Trait VectorScalar is not implemented for f32" when getting Vec<Vec3> data from ReadbackComplete

[Jezorko]

Here is a super minimal example:

use bevy::math::Vec3;
use bevy::prelude::Trigger;
use bevy::render::gpu_readback::ReadbackComplete;

fn readback_complete_compilation_issue(trigger: Trigger<ReadbackComplete>) {
    let readback_result: Vec<Vec3> = trigger.event()
                                            .to_shader_type(); // Error: Trait `VectorScalar` is not implemented for `f32`
}

However, if I add this seemingly unrelated line:

use bevy::math::{vec3, Vec3};
use bevy::prelude::Trigger;
use bevy::render::gpu_readback::ReadbackComplete;
use bevy::render::storage::ShaderStorageBuffer;

fn readback_complete_compilation_issue(trigger: Trigger<ReadbackComplete>) {
    let _ = ShaderStorageBuffer::from(vec![vec3(0.0, 0.0, 0.0)]);
    let readback_result: Vec<Vec3> = trigger.event()
                                            .to_shader_type(); // Now compiles fine!
}

even if this line is never actually reached:

if false {
    let _ = ShaderStorageBuffer::from(vec![vec3(0.0, 0.0, 0.0)]);
}

My guess is this has something to do with how VectorScalar is implemented in encase with a macro (https://github.com/teoxoy/encase/blob/f6cdf9f4fc4afc47da04a67a855f9db58fb28cd9/src/types/vector.rs#L2), though I am new to Rust so am not entirely sure.

Is there any way to resolve this compilation error without the extra line? 🙏 (this is bevy version 0.16.1 btw)

[gwafotapa]

I don't see how that extra line can affect your problem. The first block of code with an empty main function compiles without errors on my machine with Bevy 0.16.1.

[Jezorko]

Actually, you are right! It compiles for me too :O

I think it's an IDE issue: